Ability to view other players network/me pages as an administrator team

Let the admin team view another player's /me (and network) pages.

Grounded: economy-explorer/app/me/page.tsx (+ app/me/market) resolve the viewer's own identity from the session and are strictly self-scoped. There's no way for an admin to inspect a specific player's personal dashboard.

Add an admin-only impersonation/lookup: e.g. /me?as=<player> (or /admin/players/<uuid>) gated on the admin role via getViewer()/requireRole, reusing the same /me data functions but keyed on the target player. Audit the access (explorer_audit) since it exposes another player's private financial view.